The XLAB Aero Time Trial Spare Bottle is a replacement for your most aerodynamic system. It now comes with a black option for your stealth looking setup. It can hold 20 oz or 590 mL of water. Time Trials are centered around aero performance and this bottle provides 50 percent drag savings compared to a standard water bottle. This adds up to about 64 seconds of improvement over a full length race. The XLAB Aero Time Trial Spare Bottle is a simple and perfect hydration solution for your fastest bike.